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* KASAN: vmalloc-out-of-bounds Write in imageblit
@ 2021-01-06 10:06 syzbot
  2021-02-15 17:49 ` syzbot
  0 siblings, 1 reply; 4+ messages in thread
From: syzbot @ 2021-01-06 10:06 UTC (permalink / raw)
  To: dri-devel, linux-fbdev, linux-kernel, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    6207214a Merge tag 'afs-fixes-04012021' of git://git.kerne..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17d0c7a8d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=104b0cac547b2149
dashboard link: https://syzkaller.appspot.com/bug?extid=858dc7a2f7ef07c2c219
compiler:       gcc (GCC) 10.1.0-syz 20200507
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+858dc7a2f7ef07c2c219@syzkaller.appspotmail.com

BUG: KASAN: vmalloc-out-of-bounds in fast_imageblit drivers/video/fbdev/core/sysimgblt.c:229 [inline]
BUG: KASAN: vmalloc-out-of-bounds in sys_imageblit+0x117f/0x1290 drivers/video/fbdev/core/sysimgblt.c:275
Write of size 4 at addr ffffc9000bc11000 by task syz-executor.1/10779

CPU: 0 PID: 10779 Comm: syz-executor.1 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5/0x2f8 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
 fast_imageblit drivers/video/fbdev/core/sysimgblt.c:229 [inline]
 sys_imageblit+0x117f/0x1290 drivers/video/fbdev/core/sysimgblt.c:275
 drm_fb_helper_sys_imageblit drivers/gpu/drm/drm_fb_helper.c:794 [inline]
 drm_fbdev_fb_imageblit+0x15c/0x350 drivers/gpu/drm/drm_fb_helper.c:2266
 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline]
 bit_putcs+0x6e1/0xd20 drivers/video/fbdev/core/bitblit.c:188
 fbcon_putcs+0x35a/0x450 drivers/video/fbdev/core/fbcon.c:1304
 do_update_region+0x399/0x630 drivers/tty/vt/vt.c:676
 redraw_screen+0x658/0x790 drivers/tty/vt/vt.c:1035
 fbcon_modechanged+0x593/0x6d0 drivers/video/fbdev/core/fbcon.c:2656
 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:2701
 do_fb_ioctl+0x62e/0x690 drivers/video/fbdev/core/fbmem.c:1110
 fb_compat_ioctl+0x17e/0x610 drivers/video/fbdev/core/fbmem.c:1309
 __do_compat_sys_ioctl+0x1d3/0x230 fs/ioctl.c:842
 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline]
 __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f12549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f550c0bc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004601
RDX: 0000000020000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000


Memory state around the buggy address:
 ffffc9000bc10f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000bc10f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000bc11000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                   ^
 ffffc9000bc11080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc9000bc11100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

^ permalink raw reply	[flat|nested] 4+ messages in thread
* KASAN: vmalloc-out-of-bounds Write in imageblit
@ 2021-10-06  9:24 Hao Sun
  2021-10-27  1:20 ` Hao Sun
  0 siblings, 1 reply; 4+ messages in thread
From: Hao Sun @ 2021-10-06  9:24 UTC (permalink / raw)
  To: dri-devel, linux-fbdev, Linux Kernel Mailing List

Hello,

When using Healer to fuzz the latest Linux kernel, the following crash
was triggered.

HEAD commit: 42d43c92fc57  Merge branch 'for-linus'
git tree: upstream
console output:
https://drive.google.com/file/d/1fV8jSOKPspCPI-4i7Ee_FJIPIvz24MYu/view?usp=sharing
kernel config: https://drive.google.com/file/d/15vWoQRbJuuMu4ovWhUm1h4SrHyNwK8im/view?usp=sharing

Sorry, I don't have a reproducer for this crash, hope the symbolized
report can help.
If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@gmail.com>

==================================================================
BUG: KASAN: vmalloc-out-of-bounds in fast_imageblit
drivers/video/fbdev/core/sysimgblt.c:229 [inline]
BUG: KASAN: vmalloc-out-of-bounds in sys_imageblit+0x1372/0x13f0
drivers/video/fbdev/core/sysimgblt.c:275
Write of size 4 at addr ffffc90005741000 by task syz-executor/15849

CPU: 0 PID: 15849 Comm: syz-executor Not tainted 5.15.0-rc3+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0xf/0x334 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 fast_imageblit drivers/video/fbdev/core/sysimgblt.c:229 [inline]
 sys_imageblit+0x1372/0x13f0 drivers/video/fbdev/core/sysimgblt.c:275
 drm_fb_helper_sys_imageblit+0x1c/0x180 drivers/gpu/drm/drm_fb_helper.c:794
 drm_fbdev_fb_imageblit+0x179/0x260 drivers/gpu/drm/drm_fb_helper.c:2276
 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline]
 bit_putcs+0x8ed/0xd80 drivers/video/fbdev/core/bitblit.c:188
 fbcon_putcs+0x362/0x450 drivers/video/fbdev/core/fbcon.c:1296
 do_update_region+0x399/0x630 drivers/tty/vt/vt.c:676
 invert_screen+0x2a7/0x610 drivers/tty/vt/vt.c:800
 highlight drivers/tty/vt/selection.c:57 [inline]
 clear_selection drivers/tty/vt/selection.c:84 [inline]
 clear_selection+0x55/0x70 drivers/tty/vt/selection.c:80
 vc_do_resize+0xda8/0x10a0 drivers/tty/vt/vt.c:1257
 fbcon_do_set_font+0x47e/0x780 drivers/video/fbdev/core/fbcon.c:2397
 fbcon_set_font+0x81e/0xa10 drivers/video/fbdev/core/fbcon.c:2483
 con_font_set drivers/tty/vt/vt.c:4666 [inline]
 con_font_op+0x73a/0xca0 drivers/tty/vt/vt.c:4710
 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline]
 vt_ioctl+0x1de9/0x2af0 drivers/tty/vt/vt_ioctl.c:752
 tty_ioctl+0xc80/0x1450 drivers/tty/tty_io.c:2805
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fbb0c85cc4d
Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48
89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d
01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbb09dc4c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbb0c9830a0 RCX: 00007fbb0c85cc4d
RDX: 0000000020000080 RSI: 0000000000004b72 RDI: 0000000000000006
RBP: 00007fbb0c8d5d80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbb0c9830a0
R13: 00007ffdbece6b9f R14: 00007ffdbece6d40 R15: 00007fbb09dc4dc0


Memory state around the buggy address:
 ffffc90005740f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90005740f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90005741000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                   ^
 ffffc90005741080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc90005741100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================

^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-10-27  1:20 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2021-01-06 10:06 KASAN: vmalloc-out-of-bounds Write in imageblit syzbot
2021-02-15 17:49 ` syzbot
2021-10-06  9:24 Hao Sun
2021-10-27  1:20 ` Hao Sun

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